The invention relates to a utility knife, comprising a housing (11) and a blade holder (13) that is movable between a rear position and a cutting position in the housing (11), comprising a return device (34), which can load the blade holder (13) into the rear position relative to the housing.

The special feature is that the return device (34) is mounted on the housing (11) or the blade holder (13) and comprises a spring (35), wherein the return device (34) comprises a movable element which is connected to one end of the spring and is urged in a travel direction by this one end of the spring, wherein the movable element interacts with the blade holder (13) and the housing (11) and the blade holder (13) is urged into the rear position in at least one region of movement of the blade holder (13) .

The apparatus has a blade retaining member that is elongated in a longitudinal direction, a recess disposed in the blade retaining member, the recess having a first portion extending in the longitudinal direction and a second portion extending in a radial direction, a protruding portion that extends from the blade retaining member in the longitudinal direction, and a protrusion disposed on the protruding portion. The recess is a first attachment portion configured to removably attach the removably-attachable blade cartridge to a first cutting device. The protrusion is a second attachment portion configured to removably attach the removably-attachable blade cartridge to a second cutting device.

The present invention relates to a safety cutter including a housing which receives a trigger, a transmission member, a pusher, a blade carrier and a blade. The transmission member is engaged operatively with the trigger via a gear assembly. The gear assembly allows the safety cutter to move the blade outward for a longer distance than conventional safety cutters. To prevent the gear assembly and the trigger rack portion from being displaced by tension generated during cutting, a first limiting member and a pair of second limiting members are provided in the housing. The blade carrier is releasably engaged with the transmission member to achieve automatic retraction of the blade into the housing after the blade leaves the cutting surface even if the trigger is not released.

A utility knife is provided, including: a first housing, a second housing, a blade carrier and a locking mechanism. The first housing includes a shaft disposed thereon and having an axis. The second housing is rotatably mounted to the shaft and includes a first engaging portion. The blade carrier is movably received between the first housing and the second housing, and is operable to move. The locking mechanism is disposed through the second housing and non-rotatable relative to the shaft. The locking mechanism is axially slidable between a locking position and a releasing position along the shaft and rotatable about the axis. When the locking mechanism is in the locking position, the second housing is non-rotatable relative to the first housing; when the locking mechanism is in the releasing position, the second housing is rotatable about the locking mechanism and rotatable relative to the first housing.

A multifunctional utility knife includes a body and a blade housed by the body. The body has an open end surface. The open end surface extends on a reference plane. The blade has a cutting edge including a first cutting edge portion and a second cutting edge portion configured for different cutting tasks. The blade in a use position includes the first and the second cutting edge portions disposed outside the body. The first cutting edge portion extends arcuately. The second cutting edge portion extends linearly along a reference line which intersects with the reference plane.

A utility knife configured with a retractable cutting blade that is extended and retracted by a blade actuation mechanism. The blade actuation mechanism includes a slider button assembly and a blade carriage assembly that are operably connected in variety of configurations, including a configuration with a rack-and-pinion arrangement between the slider button assembly and the blade carriage assembly. The rack-and-pinion blade actuation mechanism is configured to automatically retract the cutting blade as the cutting blade is lifted from the cutting surface.

The present utility model discloses a utility knife with dual blades, comprising a housing having an opening at both ends, a blade carrier which is mounted and is movable within the housing, a movement assembly connected to the blade carrier for driving the blade carrier to respectively move in a direction towards both ends of the housing, wherein it further comprises a stop member. The blade carrier is provided with an abutment portion thereon, and the stop member has a stop portion being able to change its position with respect to the abutment portion, so that the blade carrier can move in a single direction so as to prevent the blade carrier from accidentally sliding and pushing the blade out to injure a user.

The present invention provides a retractable cutting tool, which includes: a cutting tool housing, the interior thereof forming a cavity; a blade exit portal, penetrating through the cutting tool housing and communicating with the cavity; a blade holder, moved or locked in the cutting tool housing; a blade, mounted to the blade holder and disposed opposite the blade exit portal; when the blade holder is moved, the front end of the blade protrudes out of the cutting tool housing or retracts into the cutting tool housing through the blade exit portal; a blade holder moving device, for moving the blade holder in the cutting tool housing; and a protrusion length control device, for controlling the protrusion length of the blade outside the cutting tool housing.

A box cutter includes a handle, a holder and a linkage. The handle includes a front slot in communication with a space. The holder is formed with a boss and operable for holding a portion of a blade. The linkage includes a sliding element formed with a pusher. The linkage is operable to move the sliding element toward the holder to abut the pusher against the boss to move the holder toward the front slot to extend a pointed end of the blade from the space through the front slot when the boss is located between the front slot and the pusher. The pusher is biased from the boss to allow the holder to return to its original position when the pusher is located between the front slot and the boss.

A drywall multi-tool assembly includes a block that has a plurality of intersecting sides such that the block has a triangular shape. A saw is pivotally coupled to the block for cutting drywall from a plurality of orientations. A knife is slidably coupled to the block for cutting the drywall. A ruler is pivotally coupled to the block for making measurements and a square is pivotally coupled to the block for measuring a right angle. A first bubble level is coupled to the block to determine level along a first axis. A second bubble level is coupled to the block to determine level along a second axis. A rasp is coupled to the block wherein the rasp is configured to abrade the drywall.